2024 BMW Hybrid Drivability Complaints TSB SIB 24 03 24

BMW has issued Service Information Bulletin SIB 24 03 24 to address various drivability complaints affecting 2024 hybrid models, including the X5, X3, and XM. Owners may experience issues ranging from reduced power during electric driving to problems with the internal combustion engine (ICE) starting, and specific fault codes may be stored. This bulletin provides diagnostic and repair procedures for technicians to resolve these 2024 BMW hybrid drivability complaints.

Symptoms of Hybrid Drivability Issues

Owners of affected 2024 BMW hybrid vehicles may notice several symptoms related to the electric, ICE, or hybrid driving systems. These issues can impact vehicle performance and overall driving experience.

Electric Driving Symptoms

• A noticeable power reduction while operating in electric driving mode.
• Electric driving may not be possible, even when the high voltage (HV) battery indicates a sufficient charge level.

Internal Combustion Engine (ICE) Starting Symptoms

• The ICE may cut in noticeably when it starts.
• The ICE might start slower than usual.
• A Check Control Message (#2390) displaying "Engine is starting... Please wait." may appear.
• The electric drive may not start at all.

Hybrid Driving Symptoms

• Reduced acceleration during hybrid operation.
• Jolts experienced during upshifts.
• Delays occurring during downshifts.

Fault Codes (DTCs) You Might See

Technicians diagnosing these 2024 BMW hybrid drivability complaints may find specific fault codes stored in the vehicle's control units. These codes point towards potential issues within the EGS-EME (Electric Gearbox System - Electric Machine Electronics) and DME (Digital Motor Electronics) modules.

Code	Module	Description
039A2A	EGS-EME	Temperature sensor, coolant: Excess temperature
039A2B	EGS-EME	Excess temperature
BA0842	EGS-EME	Temperature sensor, coolant circuit: upper threshold value exceeded
BA0845	EGS-EME	Temperature sensor, coolant circuit: Gradient implausible
034D5C	DME	Cooling failed: Inverter

Potential Causes

The primary cause for these 2024 BMW hybrid drivability complaints often lies within the low-temperature coolant circuit. Several factors can contribute to its malfunction:

• Low Coolant Level: The coolant level in the low-temperature coolant circuit may be too low. It's important to note that the expansion tank for this circuit does not have a coolant level indicator.
• Contaminated Radiator: The cooler fins of the low-temperature coolant radiator can become contaminated with debris such as leaves or flower pollen.
• Obstructed Coolant Duct: The coolant duct within the Combined Charging Unit (CCU) might be obstructed.
• Obstructed Coolant Hoses: The coolant hoses (feed or return) connected to the CCU could be obstructed by foreign objects or pinching.

Repair Procedure Summary

To address the 2024 BMW hybrid drivability complaints outlined in SIB 24 03 24, technicians follow a two-step procedure focusing on the cooling system and the Combined Charging Unit (CCU).

Step 1: Cooling System Check

Technicians will first inspect the low-temperature cooling system. This involves checking the coolant level and ensuring it is correct, performing any necessary repairs. They will also check for leaks and inspect the radiator fins for damage or debris. After repairs, the vehicle and its fault codes are re-evaluated. If the issue persists or no obvious coolant problems were found, technicians proceed to the next step.

Step 2: Combined Charging Unit (CCU) Inspection

The second step involves removing the Combined Charging Unit (CCU) as per Repair Instructions 61 42 000. Once removed, technicians will check the coolant duct within the CCU for obstructions or flow rate using compressed air or water. The coolant hoses connected to the CCU are also checked for obstructions using manual pressure. If an obstruction or reduced flow rate is detected, the faulty component must be replaced. If no fault is found during these checks, further diagnosis is required.

Important Warnings for Owners

Owners should be aware that continuous driving after the EME/electric drive cools down may result in the ICE remaining permanently engaged in SPORT mode. Also, damage or operational issues caused by external factors, direct or indirect obstructions, are typically not covered under BMW limited warranties.

Parts Information

When specific parts are required for repair, technicians determine the correct part numbers by entering the vehicle's VIN or chassis number into the Electronic Parts Catalog (ETK) or Aftersales Information Research (AIR) system. This ensures that the parts ordered are appropriate for the specific vehicle and its fitted options.

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Source: NHTSA ID: 11010756